CN110679063A

CN110679063A - Claw-pole stator for a transverse flux motor and segment for a claw-pole stator

Info

Publication number: CN110679063A
Application number: CN201880029747.6A
Authority: CN
Inventors: N·博尔内曼; S·蒂勒; R·施米特; H·G·托
Original assignee: GKN Sinter Metals Holding GmbH
Current assignee: GKN Sinter Metals Holding GmbH
Priority date: 2017-03-14
Filing date: 2018-03-07
Publication date: 2020-01-10
Anticipated expiration: 2038-03-07
Also published as: CN110679063B; WO2018166858A1; EP3596802A1; EP3596802B1; US20200014255A1; US11289955B2; DE102017105361A1; JP2020511929A

Abstract

The invention relates to a claw-pole stator (1, 29) for a transverse flux motor (2), wherein the claw-pole stator (1, 29) is formed by a plurality of segments 3 which are arranged next to one another in the circumferential direction 4 and form an annular claw-pole stator (1), wherein each segment (3) extends from an inner circumferential surface (5) in the radial direction (6) towards an outer circumferential surface (7) and is bounded in the circumferential direction (4) by a first lateral surface (8) and a second lateral surface (9) and in the axial direction (10) by a first end surface (11) and a second end surface (12), wherein, in order to form the annular claw-pole stator (1), each segment (3) is connected to a further segment (3) via the lateral surfaces (8, 9), wherein the segments (3) arranged next to one another are in contact with one another via a first contact surface (13) on the first lateral surface 8 or via a second contact surface (14) on the second lateral surface (9), and a form-locking connection (15) is formed along the circumferential direction (4) via the contact surfaces (13, 14).

Description

Claw-pole stator for a transverse flux motor and segment for a claw-pole stator

Technical Field

The invention relates to a claw-pole stator for a transverse flux motor and to a segment for a claw-pole stator. Transverse flux motors are electric drives that can be used as generators and motors. Transverse flux motors typically include a stator and a rotor. The rotor is referred to herein as a support for the permanent magnets, while the stator has coil assemblies. The rotor or stator may be connected to a shaft that is driven by the tfem (operating as a motor) or that transmits rotational motion to the tfem (operating as a generator).

Background

An electric axial flux machine is known, for example, from DE 102009021703B 4. There are proposed in particular: the magnetic flux yoke is formed by a plurality of annular cylinder segments. The annular cylinder segments are in contact with one another on the sides pointing in the circumferential direction.

Particularly advantageous are: the claw-pole stator is produced powder metallurgically. For this purpose, a powder having a predetermined composition is fed to a press and pressed. Subsequent heat treatment is used to remove the organic constituents. In particular, the powder particles have an electrically insulating coating. High-precision components can be produced by powder metallurgy manufacturing.

It has now been demonstrated that: the special geometry of the claw-pole stator cannot be produced metallurgically from powder without problems. In particular, the thinned poles of claw-pole stators cannot be produced very uniformly and with high density without problems.

Disclosure of Invention

Starting from this, the object of the invention is: the problems described with respect to the prior art are at least partially solved. In particular, a claw-pole stator is to be proposed, which is designed to be particularly suitable for powder-metallurgical production.

In order to achieve the object, a claw-pole stator according to the features of claim 1 and a segment for a claw-pole stator according to claim 11 are proposed. Advantageous developments are the subject matter of the dependent claims. The features which are embodied individually in the claims can be combined with one another in a technically meaningful manner and can be supplemented by the facts stated in the description and the details shown in the drawings, in which further embodiment variants of the invention are indicated.

This is facilitated by a claw-pole stator for a transverse flux motor, which claw-pole stator is formed by a plurality of segments which are arranged next to one another in the circumferential direction or form an annular claw-pole stator. Each segment extends from the inner circumferential surface in the radial direction towards the outer circumferential surface and is bounded in the circumferential direction by a first lateral surface and a second lateral surface and in the axial direction by a first end surface and a second end surface. In order to form an annular claw-pole stator, each segment is connected to at least one further segment via a side surface, wherein the segments arranged next to one another are in contact with one another via a first contact surface of a first side surface or via a second contact surface of a second side surface of the respective segment and form-locking connections in the circumferential direction are formed via these contact surfaces.

In particular, the first section is in contact with an adjacently arranged second section via its first contact surface or its second contact surface. If the two segments coincide with one another, the first segment can contact the second segment (directly or directly) via its first contact surface via its second contact surface. The same may be correspondingly adapted to the further second side face of the first section and the second contact face arranged there.

It is proposed here to segment the claw-pole stator. The individual segments can thus be produced with a compact-designed die of the punching tool. In particular, special measures for producing a density that is as uniform and high as possible can be implemented relatively simply in the segments.

However, the segmentation of the claw-pole stator leads to the problem of the claw-pole stator being assembled in a ring shape from segments. In this case, on the one hand, good handling of the segments and, on the other hand, as precise a positioning of the segments relative to one another as possible should be achieved. This is currently achieved or ensured by the formation of a form-locking connection in the circumferential direction between adjacent segments. The positive connection is produced by the interlocking engagement of at least two connection partners (here, segments). As a result, the connection partner cannot be released without force transmission or with interrupted force transmission. In other words, in a form-fitting connection, one connection partner forms an obstacle (in this case with respect to a relative movement in the circumferential direction relative to one another) for the other connection partner.

The individual segments can be assembled to form the annular claw-pole stator by means of a form-locking connection. In particular, the segments can be arranged on a support which orients or maintains the segments relative to one another at least on their inner or outer circumferential surfaces. Preferably, the segments are then connected to one another, for example, via a plastic which is supplied to the claw-pole stator, for example in the liquid state, and then solidifies.

The construction of the claw-pole stator is explained below. Two claw-pole stators are arranged side by side in the axial direction, and are in contact with each other via end faces. Each claw-pole stator has a plurality of poles extending in an axial direction from a base surface. The first poles of the first claw-pole stator and the second poles of the second claw-pole stator are arranged alternately in the circumferential direction and respectively adjacent to one another and overlapping one another in the axial direction, but spaced apart from one another. The poles may be provided on the inner or outer circumferential surface. The claw pole stators are in contact with each other on the outer circumferential surface or the inner circumferential surface via the end surfaces. Coils may be circumferentially arranged between the claw-pole stators in the axial direction between the end faces and in the radial direction between the end faces and the poles that are in contact with each other in the center gap of the claw-pole stators. It is likewise possible to provide further claw-pole stator pairs with coils on the first pair. This makes it possible to form a polyphase transverse flux motor, for example. The transverse flux motor may in particular provide an electrical power of from 0.01kW (kilowatts) up to over 5000 kW.

Positioning aids can be provided on the end faces of the claw-pole stator, which cooperate with corresponding positioning aids (for example elevations and depressions) on the opposite end face.

In particular, at least one of the contact surfaces extends meanders in a radial direction between a first radius and a second radius. "meanderly" means in particular that the surface has a curvature, in particular a radius of curvature which is oriented alternately with respect to the radial direction. The course can be "meandering" if the contact surface extends on both sides of an imaginary line which is central or central to the course of the contact surface and parallel to the radial direction.

In particular, the poles are arranged outside or inside the contact surface in the radial direction.

A contact surface is provided on each side of the segment. The contact surface comprises a lateral sub-surface. In particular, the contact surface extends along the axial direction over the entire extension of the side surface. Preferably, the contact surface extends in the radial direction over only a part of the extension of the side face.

The contact surface extends in a meandering manner in the radial direction, wherein a form-locking connection to the adjacent segments is formed by the meandering form of the contact surface.

Such a meandering (however sharp-edged) course of the contact surface is achieved, for example, by a dovetail embodiment of the contact surface.

Preferably, at least one of the contact surfaces has a minimum radius of curvature along the serpentine course of at least 1.0mm (millimeter), preferably at least 2.0 mm. Such a minimum radius reduces the risk of crack formation in the segments, which can occur precisely in the sharp-edged embodiments of the form-locking connection (for example, dovetails).

In particular, the at least one contact surface has a solely curved course along a meandering course. In particular, no straight line region of the contact surface is provided in the radial direction. That is, each point of the contact surface is constituted by a radius of curvature (which varies in the radial direction) in the radial direction.

Preferably, the at least one contact surface extends along a meandering course over a length which is greater by at least 1.5 times, in particular at least two (2.0) times, than the distance between the first radius and the second radius in the radial direction. The contact surface is thus elongated (in contrast to a straight line running in the radial direction between the first radius and the second radius) due to the meandering course.

Furthermore, the increase in contact surface improves the strength of the bonded claw-pole stator. Furthermore, the meandering and the increase in the contact surface reduce the play of the individual segments and the relative mobility with respect to one another, so that the handling of the claw-pole stator, for example for the arrangement on the support body, can be improved.

According to a first embodiment, each segment comprises a plurality of poles.

According to a second embodiment, each segment has exactly one (individual) pole. In such a segment, a particularly compact form of a punching tool can be used, which is used for producing the segment. In addition, additional measures can be taken to further homogenize the density in the stamping (blank) in a simple and economical manner.

The segments allow the claw-pole stator to be produced economically and with high precision, since on the one hand very small segments can be produced with high precision and on the other hand the segments can be precisely oriented and arranged relative to one another via a centering device (e.g. a support). The high-precision form of the claw-pole stator thus produced can then be fixed by fixing means, for example embedded in plastic.

Specifically, the following steps are provided: each of the segments is powder metallurgically produced by pressing and heat treating.

Preferably, the claw-pole stator is constructed only by sections of uniform design. The segments have first contact surfaces which form a form-locking connection with second contact surfaces of adjacent, identical segments.

In particular, the claw-pole stator has a cylindrical contour with segmented outer or inner circumferential surfaces, wherein one of the outer and inner circumferential surfaces is formed by the segmented poles, wherein the circumferential surfaces have a deviation from the cylindrical contour of at most 50 μm (micrometer), in particular at most 25 μm.

In particular, the segments are already fixed in their position relative to one another here, for example by embedding in plastic.

A segment for a claw-pole stator, in particular as described in detail herein, is proposed, which extends from an inner circumferential surface in the radial direction to an outer circumferential surface and is bounded in the circumferential direction by a first lateral surface and a second lateral surface and in the axial direction by a first end surface and a second end surface. In order to form an annular claw-pole stator, the segments are connectable via a side face to at least one further segment, wherein the segments that can be arranged next to one another are in contact with one another via a first contact surface of the first side face or via a second contact surface of the second side face. The contact surfaces are shaped in such a way that, via these contact surfaces, a form-fitting connection in the circumferential direction can be formed in each case with the complementary shaped contact surfaces of the adjacently positionable segments.

In particular, at least one of the contact surfaces (preferably both contact surfaces) extends parallel to the axial direction.

In particular, the segmented poles extend in the axial direction starting from the base surface and taper at the same time. The pole has a maximum cross section and a minimum cross section in the region of the taper, respectively, transversely to the axial direction. The ratio of the maximum cross-section to the minimum cross-section is at least two (2) and preferably at least three (3).

In particular, the segmented powder is metallurgically produced by pressing and heat treatment.

According to a further aspect, a transverse flux motor is proposed, which comprises at least a stator and a rotor, the stator comprising at least two of the aforementioned claw-pole stators, wherein the first poles of the first claw-pole stator and the second poles of the second claw-pole stator are arranged alternately in the circumferential direction and respectively adjacent to each other and overlapping each other in the axial direction. The claw-pole stators are arranged relative to one another in such a way that the poles extend from the base surface in the axial direction to the other claw-pole stator.

The axial direction is oriented parallel to a rotational axis of the transverse flux motor.

In particular, the rotor extends in a ring shape and has a plurality of permanent magnets in the circumferential direction, wherein a circumferentially encircling air gap is provided between the rotor and the stator, which air gap is at most 350 μm (micrometer), in particular at most 250 μm, preferably at most 150 μm, in the radial direction, wherein the air gap has a deviation of at most 50 μm, in particular at most 25 μm.

The embodiments relating to claw-pole stators are also suitable for segmented and/or transverse flux motors, and vice versa.

The transverse flux motor is particularly useful for electrically operated bicycles (motorized bicycles).

For the sake of precaution: the numerical values ("first", "second" … …) used here are intended primarily (exclusively) to distinguish a plurality of objects or parameters of the same type, in particular without necessarily presetting their mutual relevance and/or order. If dependency and/or order is required, this is given here in detail or will be apparent to the skilled person when studying the specifically described design.

Drawings

The invention and the technical field are further explained below with the aid of the drawings. It is to be noted that: the invention should not be limited by the illustrated embodiments. In particular, if not specified otherwise, it is also possible: a point of view of the fact set forth in the accompanying drawings is extracted and combined with other components and insights from the present description and/or drawings. In particular, it is noted that: the figures and in particular the parameter ratios shown are schematic. The same reference numerals denote the same objects, and explanations from other drawings may be additionally referred to as necessary. In the drawings:

FIG. 1 shows a perspective view of a transverse flux motor in an exploded view;

FIG. 2 illustrates a perspective view, partially in section, of the transverse flux motor of FIG. 1;

FIG. 3 illustrates a perspective view of a portion of the transverse flux motor shown in FIGS. 1 and 2;

FIG. 4 shows a perspective view of a claw-pole stator;

FIG. 5 shows a first perspective view of a segment;

FIG. 6 shows a second perspective view of the segment shown in FIG. 5;

fig. 7 shows a side view of the segment shown in fig. 5 and 6.

Detailed Description

Fig. 1 shows a perspective view of a transverse flux motor 2 in an exploded view. Fig. 2 shows a perspective view, partially in section, of the transverse flux motor 2 shown in fig. 1. Fig. 3 shows a perspective view of a portion of the transverse flux motor shown in fig. 1 and 2. Fig. 1 to 3 are collectively described below.

The transverse flux motor 2 furthermore comprises a stator 26 and a rotor 27, the stator 26 in this case comprising six claw-pole stators 1, wherein the first poles 19 of each first claw-pole stator 1 and the second poles 28 of each second claw-pole stator 29 are arranged alternately in the circumferential direction 4 and respectively adjacent to one another and overlapping one another in the axial direction 10. The claw-

pole stators

1, 29 are arranged relative to one another in such a way that the

poles

19, 28 extend from the base surface 22 in the axial direction 10 toward the other claw-

pole stator

29, 1.

The axial direction 10 is oriented parallel to the axis of rotation 32 of the transverse flux motor 2.

The rotor 27 extends in a ring shape and has a plurality of permanent magnets 30 along the circumferential direction 4, wherein an air gap 31 is provided between the rotor 27 and the stator 26, which air gap is surrounded in the circumferential direction 4.

Each claw-

pole stator

1, 29 is formed by a plurality of segments 3, which are arranged next to one another in the circumferential direction 4 and form an annular claw-

pole stator

1, 29. Each segment 3 extends from the inner circumferential surface 5 in the radial direction 6 to the outer circumferential surface 7 and is bounded in the circumferential direction 4 by a first lateral surface 8 and a second lateral surface 9 and in the axial direction 10 by a first end surface 11 and a second end surface 12. In order to form an annular claw-pole stator 1, each segment 3 is connected to a further segment 3 via side faces 8, 9. Fig. 1 to 3 do not show the form-locking connection 15 of the segments 3.

The two claw-

pole stators

1, 29 are arranged next to one another in the axial direction 10, and they are in contact with one another via the first end face 11. Each claw-

pole stator

1, 29 has a plurality of

poles

19, 28 which extend from the base surface 22 in the axial direction 10. The first poles 19 of the first claw-pole stator 1 and the second poles 28 of the second claw-pole stator 29 are arranged alternately and respectively adjacent to one another in the circumferential direction 4 and overlapping one another in the axial direction 10, however spaced apart from one another. The

poles

19, 28 are arranged on the outer circumferential surface 7 of the segment 3. The claw-

pole stators

1 and 29 contact each other via the first end surface 11 on the inner circumferential surface 5. In the intermediate space between the claw-

pole stators

1, 29, between the first end faces 11 in the axial direction 10 and in the region of the inner circumferential surface 5 in the radial direction 6 between the first end faces 11 which are in contact with one another and on the outer circumferential surface 7 between the

poles

19, 28, a coil 33 can be arranged circumferentially between the claw-pole stators 1 in the circumferential direction 4.

Fig. 4 shows a perspective view of the claw-pole stator 1. The claw-pole stator 1 is formed by a plurality of segments 3, which are arranged next to one another in the circumferential direction 4 and form an annular claw-pole stator 1. Each segment 3 extends from the inner circumferential surface 5 in the radial direction 6 to the outer circumferential surface 7 and is bounded in the circumferential direction 4 by a first lateral surface 8 and a second lateral surface 9 and in the axial direction 10 by a first end surface 11 and a second end surface 12. In order to form an annular claw-pole stator 1, each segment 3 is connected to a further segment 3 via side faces 8, 9. The segments 3 arranged next to one another are in contact with one another via a first contact surface 13 of the first side surface 8 or a second contact surface 14 of the second side surface 9 of the respective segment (see fig. 5 to 7) and form a form-locking connection 15 in the circumferential direction 4 via the contact surfaces 13, 14.

The positive connection 15 is produced by the interlocking engagement of at least two connection partners (in this case the segments 3). The connection partners cannot therefore be released even without force transmission or with interrupted force transmission. In other words, in the form-locking connection 15, one connection partner forms an obstacle to the other connection partner (in this case with respect to a mutual relative movement in the circumferential direction 4). The individual segments 3 can be assembled to form a ring-shaped claw-pole stator 1 by means of a form-locking connection 15.

The contact surfaces 13, 14 extend in a meandering manner along the radial direction 10 between a first radius 16 and a second radius 17. The poles 19 are arranged outside the contact surfaces 13, 14 in the radial direction 6. Contact surfaces 13, 14 are provided on each

side

8, 9 of the segment 3. The contact surfaces 13, 14 comprise facets of the side surfaces 8, 9. The contact surfaces 13, 14 extend along the axial direction 10 over the entire extension of the side surfaces 8, 9, respectively. The contact surfaces 13, 14 extend in the radial direction 6 over only a part of the extension of the side surfaces 8, 9.

The contact surfaces 13, 14 extend in a meandering manner along the radial direction 6, wherein a form-locking connection 15 with the adjacent segments 3 is formed by the meandering form of the contact surfaces 13, 14.

All segments 3 are designed in accordance with one another in such a way that the first segment 3 is in contact with the second segment 3 via its first contact surface 13 via its second contact surface 14. The same applies correspondingly to the other second side faces 9 of the first portion 3 and to the second contact surfaces 14 arranged there.

Fig. 5 shows a first perspective view of the segment 3. Fig. 6 shows a second perspective view of the segment 3 shown in fig. 5. Fig. 7 shows a side view of the segment 3 shown in fig. 5 and 6. Fig. 5 to 7 are collectively described below.

The segment 3 extends from the inner circumferential surface 5 in the radial direction 6 to the outer circumferential surface 7 and is bounded in the circumferential direction 4 by a first lateral surface 8 and a second lateral surface 9 and in the circumferential direction 10 by a first end surface 11 and a second end surface 12. In order to form an annular claw-pole stator 1, the segments 3 can be connected to further segments 3 via the side faces 11, wherein the segments 3 which can be arranged next to one another are in contact with one another via the first contact faces 13 of the first side faces 8 or the second contact faces 14 of the second side faces 9. The contact surfaces 13, 14 are formed such that, via these contact surfaces 13, 14, a form-fitting connection 15 in the circumferential direction 4 can be formed with the complementary shaped contact surfaces 14, 13 of the adjacently positionable segments 3. The two

contact surfaces

13, 14 extend parallel to the axial direction 10.

The poles 19 of the segments 3 extend from the base surface 22 in the axial direction 10 and taper there. The pole 19 has a maximum cross section 24 and a minimum cross section 23 in the region of the taper 23, respectively, transversely to the axial direction 10.

Positioning aids 34 are provided on the end faces 11, 12 of the segments 3, which cooperate with corresponding positioning aids 34 (in this case: elevations and depressions) on the opposing end faces 11, 12 of the adjacent segments of the other claw-pole stator 1.

The contact surfaces 13, 14 extend in a meandering manner along the radial direction 10 between a first radius 16 and a second radius 17.

The poles 19 are arranged outside the contact surfaces 13, 14 in the radial direction 6.

Contact surfaces 13, 14 are provided on each

side

The contact surfaces 13, 14 extend in a meandering manner along the radial direction 6, wherein a form-locking connection 15 with the adjacent segments 3 is formed by the meandering form of the contact surfaces 13, 14. The contact surfaces 13, 14 have a minimum radius of curvature 18 along a meandering course.

Such a minimum radius reduces the risk of crack formation in the segments 3, which would occur precisely in the sharp-edged embodiments (for example, dovetails) of the form-locking connection 15.

In this case, the contact surfaces 13, 14 have a solely curved course along a meandering course. No straight-line regions of the contact surfaces 13, 14 are provided in the radial direction 6. That is, each point of the contact surfaces 13, 14 is constituted by a radius of curvature 18 along the radial direction 6 (varying along the radial direction 6).

The contact surfaces 13, 14 extend along a meandering course over a length 20 which is greater by a factor than the distance 21 between the first radius 16 and the second radius 17 in the radial direction 6. Due to the meandering course, the contact surfaces 13, 14 are thus lengthened and thus increased in the radial direction 6 (compared to a straight course between the first radius 16 and the second radius 17 in the radial direction 6).

List of reference numerals

1 first claw-pole stator

2 transverse flux motor

3 segmentation

4 circumferential direction

5 inner peripheral surface

6 radial direction

7 peripheral surface

8 first side of

9 second side surface

10 axial direction

11 first end face

12 second end face

13 first contact surface

14 second contact surface

15 connection

16 first radius

17 second radius

18 radius of curvature

19 pole

20 length

21 space apart

22 base plane

23 taper part

24 maximum cross section

25 minimum cross section

26 stator

27 rotor

28 second pole

29 second claw-pole stator

30 permanent magnet

31 air gap

32 axis of rotation

33 coil

34 positioning aid

Claims

1. Claw-pole stator (1, 29) for a transverse flux motor (2), wherein the claw-pole stator (1, 29) is formed by a plurality of segments (3) which are arranged next to one another in the circumferential direction (4), wherein each segment (3) extends from an inner circumferential surface (5) in the radial direction (6) to an outer circumferential surface (7) and is delimited in the circumferential direction (4) by a first lateral surface (8) and a second lateral surface (9) and in the axial direction (10) by a first end surface (11) and a second end surface (12), wherein each segment (3) is connected to at least one further segment (3) via the lateral surfaces (8, 9), wherein the segments (3) arranged adjacent to one another are in contact with one another via a first contact surface (13) on the first lateral surface (8) or via a second contact surface (14) on the second lateral surface (9), and a form-locking connection (15) is formed along the circumferential direction (4) via the contact surfaces (13, 14).

2. The claw-pole stator (1, 29) as claimed in claim 1, wherein at least one of the contact surfaces (13, 14) extends meanderingly in the radial direction (6) between a first radius (16) and a second radius (17).

3. Claw-pole stator (1, 29) according to claim 2, wherein the at least one contact surface (13, 14) has a minimum radius of curvature (18) of at least 1mm (millimeter) along a meandering course.

4. Claw-pole stator (1, 29) according to one of the preceding claims, wherein the at least one contact surface (13, 14) has a solely curved course along a meandering course.

5. Claw-pole stator (1, 29) according to one of the preceding claims 2 to 4, wherein the at least one contact surface (13, 14) extends along a meandering course over a length (20) which is at least 1.5 times greater than a spacing (21) in the radial direction (6) between the first radius (16) and the second radius (17).

6. Claw-pole stator (1, 29) according to one of the preceding claims, wherein each segment (3) comprises a plurality of poles (19, 28).

7. Claw-pole stator (1, 29) according to one of the preceding claims 1 to 5, wherein each segment (3) has exactly one pole (19, 28).

8. Claw-pole stator (1, 29) according to one of the preceding claims, wherein each of the segments (3) is powder-metallurgically produced by extrusion and heat treatment.

9. Claw-pole stator (1, 29) according to one of the preceding claims, wherein the claw-pole stator (1, 29) is composed of sections (3) of uniform design only.

10. Claw-pole stator (1, 29) according to one of the preceding claims, wherein the segments (3) form a cylindrical contour with the outer circumferential surface (7) or the inner circumferential surface (5) of each segment (3), wherein one of the outer circumferential surface (7) and the inner circumferential surface (5) is formed by the poles (19, 28) of the segment (3), which circumferential surfaces have a deviation from the cylindrical contour of at most 50 μm.

11. Segment (3) for a claw-pole stator (1, 29), wherein the segment (3) extends from an inner circumferential surface (5) in a radial direction (6) to an outer circumferential surface (7) and is bounded in a circumferential direction (4) by a first lateral surface (8) and a second lateral surface (9) and in an axial direction (10) by a first end surface (11) and a second end surface (12), wherein the segment (3) can be connected to at least one further segment (3) via the lateral surfaces (8, 9), wherein segments (3) that can be arranged next to one another are in contact with one another via a first contact surface (13) of the first lateral surface (8) or via a second contact surface (14) of the second lateral surface (9), wherein the contact surfaces (13, 14) are shaped such that via these contact surfaces (13, 14) a complementarily shaped contact surface (14, 14) of an adjacently arranged segment (3) can be brought into contact with one another, 13) Form-locking connections (15) along the circumferential direction (4).

12. The segment (3) according to claim 11, wherein at least one of the contact surfaces (13, 14) extends parallel to the axial direction (10).

13. The segment (3) according to one of the preceding claims 11 and 12, wherein the poles (19, 28) of the segment (3) extend from the base surface (22) along the axial direction (10) and taper at the same time, wherein the poles (19, 28) have a maximum cross section (24) and a minimum cross section (25) in the region of the taper (23) in each case transversely to the axial direction (10), wherein the ratio of the maximum cross section (24) to the minimum cross section (25) is at least 2.

14. Transverse flux motor (2) comprising at least a stator (26) and a rotor (27), wherein the stator (26) comprises at least two claw-pole stators (1, 29) according to one of the preceding claims 1 to 10, wherein the first poles (19) of the first claw-pole stator (1) and the second poles (28) of the second claw-pole stator (29) are arranged alternately and respectively adjacent to each other along the circumferential direction (4) and overlapping each other along the axial direction (10).

15. Transverse flux motor (2) according to claim 14, wherein the rotor (27) extends annularly and has a plurality of permanent magnets (30) along the circumferential direction (4), wherein a gap (31) is provided between the rotor (27) and the stator (26) which runs around along the circumferential direction (4), which gap is at most 350 μm (micrometer) in the radial direction (6), wherein the gap (31) has a deviation of at most 50 μm.